A Research Study to Examine Cutaneous Allodynia and Cluster Headache

Completed

Interventions: Other: There are no interventions in the observational study. The symptom of allodynia was measured.

Brief Summary: This is a research study examining cutaneous allodynia and cluster headaches. Cutaneous allodynia means the feeling of pain or unpleasant sensation when normally non-painful stimuli (e.g. light touch) are applied to the skin. Many studies have been performed looking at the presence of cutaneous allodynia in patients with migraines; however, few studies have examined it in cluster headache patients. There is still much to be learned about the brain and how it functions if the investigators are to understand the underlying causes of cluster headache. It is important to explore cutaneous allodynia in cluster headache as it may help guide physicians with the care of these individuals. Sixty patients will be screened for this study. Thomas Jefferson University is the only center enrolling patients in this research study.

Recruitment & Eligibility

Inclusion Criteria

Male and female patients aged 18-75, inclusive
Diagnosis of cluster headache, episodic or chronic.
Patients with episodic CH can be either in active cluster period or not.
Ability to read and understand an informed consent form, where the study protocol is described.

Exclusion Criteria

Patients with abnormal sensory findings on examination, or any known neurological disease that may affect skin sensation (peripheral neuropathy, multiple sclerosis, stroke, etc).
Patients who are cognitively impaired, as determined by investigator
Patients with significant psychiatric disorder that may affect their understanding of the study protocol and/or their cooperation with the investigators.
Patients who had taken an acute pain medication within 24 hours prior to allodynia testing.
Patients with skin diseases that may cause abnormal skin sensation.
Patients who had been treated with a nerve block in the 4 week period prior to allodynia testing
Patients who had been treated with Botulinum neurotoxin within the 4 month period prior to allodynia testing

Arm && Interventions

Group	Intervention	Description
Subjects with cluster headache	There are no interventions in the observational study. The symptom of allodynia was measured.	Subjects with both episodic and chronic cluster (as defined by the International Headache Society-IHS) were enrolled.

Primary Outcome Measures

Name	Time	Method
Prevalence of Allodynia in Subjects With Cluster Headache	Allodynia was assessed at the screening visit	Allodynia (discomfort to normal sensation) was assessed by brushing at constant rate of 2 brushes/sec and pressure allodynia with Von Frei hairs. Outcome (discomfort) was measured on a 100 mm visual analogue scale.

Secondary Outcome Measures